Door-fastening mechanism



Muchwza 192s. 1,578,041

F. KNowLsoN E'r m.

DOOR FASTENING MECHANISM Filed April 13, 1925 L l mllllifllllllbwllmlllwmmm mmm ATTORNEY.

Patented Mar. 23, 1926.

UNITED sTrEs I Y y .1,578,041 PATENT ortica.

FREDERICK KNoWLsoN Ann JOHN HUBER s'rnvnnson, or Ann Anson, lammeren.

:Doon-FASTENING 'Mncnnnrsn Application filed. April 13, 1925. Serial No.22,736.

To y all -wLom t 'may concer/ni.'

Be it known that we, FREDERICK KnownsoN and JOHN HUBER S'rnvnNsoN,respectively, a subject of the King of Great Brit- 1 ain, and a citizenof the United States, resi,-

dents vof Ann Arbor, county of i/Vashtenaw,

State of Michigan, have invented a certain new and useful lniproveinentin Door-Fastening Mechanism, and declare the follow-l ing to be a full,clear, and exact description of the same, such as will. enable othersskilled in the art to which it pertains to make anduse the same,reference being hadto the accompanying` drawings, which form a part ofthis specification.

Our invention relates to door fastening mechanism particularly adaptedfor swinging doors andis shownin connection with such a door. Themechanism is of such a character as to be automatically operable toreleasably holdthe door at a `determined ope-n posit-ion. rlhe device isinexpensive-and is of simple, sturdy construction. Nhen the door hasbeen opened to the determined position, the deviceA automaticallyoperates to releasably retain the door at such open'position againstaccidental closing produced by a jar, shock, gust of wind, or .otherexternal cause. W hen thedoor is tobe closed, it is first openedslightly'beyond the position at which it is held by thefasteninginechanism and this movementreleases the fasteningmechanism topei-mitthe' closing of the door.

The above and other objects and advantages of our invention togetherwith the de'- tails of construction will more fully appear Y' from thefollowing description, accompanying drawing and appended claims.

In the drawings:

Fie. 1 is a fragmentary perspective of our invention in connection witha swinging door.

Fig. 2 is a fragmentary elevationof the locking mechanism at the initialengagement of the bumper sprin'.

F iO. 3 is a fragmentary elevation ofthe same locking mechanism in placeto hold the' door in the open position.

Fig. 4C is a fragmentary same portion of the locking mechanism movedinto positiontopermit the elosingof the door.

Fig. 5 is a fragmentary enlarged perspective of one end of the channelbar.

F i0'. 6 Vis aV longitudinal sectional view yed to engage the catch asshown in Fig. elevation of the.

taken through the fragment of the bar shown inFig. 5. 'y

. Our. invention is shown. in conjunction with a swinging door 10,which' door `is hinged in a door frame 12. The hinges are not shown inthe drawing. ille provide a channel bar lei which is loosely pivoted/atone end to the door. There is a bracket 16 having spaced apart ears 1Sbetween which the bar is pivot'ed by a pin 2O so as to have a freeswinging movement in a. horizontal plane, and the connection issufficiently loose tor permit slight Aswinging movement in a verticalplane. l f

vvWe provide a catch which is secured vto the door frame. This comprisesaplate 22 which may be .screwed to the top ofthe frame by screws 24 andtov whichplate is swiveled a yoke 26 by means of a pivot pin 28. The twosides of this yoke are cut away to permit the bar 14 to travel freelytherethrough as shownin the several figures. of

the drawing.

The bar beyond the yoke is provided with a coil spring 28. To hold thespring securely in placevand to permit of the easy assembly yand:disassembly of the mechanism, we provide a stop plate 30 adapted tosurround the bai". Lugs or portions 32 are pnched out-from the sidesvandthe top of the bar vas appears in Figs. 2, 3, and 6; l Plate BOabutsthese lugs 32 andvis held"securelyV upon thebar.

After the plate has been placed upon the bar, portions 3-1 are struck upfrom the sides `of the bar and the top on the opposite side of the plateand spaced therefrom. The coil spring 28 is then moved over the portions34 so as to abut closely against the plate 30. The spring thereby is-held securely in position upon the free end of the bar beyond the catch26. v

llife providel a dog 36 pivoted within the channel of the bar at 3S tohang normally downwardly as shown in Fig. l. This dogl is capable ofswinging in either direction from its pivot point. lThe dog is providedwith a projecting part 38 on one side adapt- 0. Then the door is openedthe bar 1st travels through the yoke 26 of the catch until the dog 3 6strikes against the side of the catch farthestremoved from the springV28 asv shown in Fig. 2, which occurs at substantially the same instantas the spring 28 bumps against the opposite side of the yoke. The

further movement of the door is against the tension of the spring andcontinues until the projecting part 3S of the dog drops below theaperture through the yoke 26 as appears in Fig. 3, and the door is thenheld in the open position. The tension of the spring is such that thedoor is locked in such open position against any accidental movementwhich might produce closing of the door.

Vhen it is desired to close the door, it is first further opened asufficient distance to trip the dog. After the dog has been tripped, thebar will travel freely through the yoke in the opposite direction.

What we claim is:

l. In a door fastening device, in combination with a door frame and adoor hinged therein, a catch secured to the door frame, a channel barpivoted at one end to the door, said bar mounted to travel over saidcatch in the opening and closing of the door, a dog pivoted within thechannel of said bar to hang normally downwardly to be engaged by thecatch as the door travels thereover and adapted to be raised up withinthe channel of the bar to permit the bar to travel over the catch, saiddog having a projecting part adapted to engage said catch to prevent theclosing of the door, a coil spring encircling the free end of the barbeyond the catch, a stop plate surrounding the bar beyond the spring,said bar having portions struclr up from the side walls thereof beyondthe stop plate and portions struck up from the side walls of the bar onthe opposite sides of the stop plate to hold the plate in place, saidcoil spring engaged over said last-named portions so as to be heldagainst the stop plate.

2. In a door fastening device, in combination with a door frame and adoor hinged therein, a catch swiveled to the door frame, a channel barypivoted at one end to the door, said bar supported bythe catch totravel thereover in the opening and closing of the door, a dogpivotedwithin the channel of the bar in proximity to the free end thereof, acoil spring surrounding the free end of the bar beyond said dog, saiddog related to swing downwardly to engage the catch when the bar travelsthereover and adapted to swing upwardly within the channel of the bar topermit the bar to travel freely over the catch, said dog having a partadapted to engage said catch during the opening of the door to preventthe return travel of the bar over the catch, a coil spring surroundingthe free end of the bar, a stop plate surrounding the bar beyond thespring, said spring adapted to engage the catch upon the vtravel of thebar thereover prior to the engagement of the catch by said part on thedog, said spring adapted to yield under pressure to permit the bar to bemoved over the catch for said part of the dog to engage therewith andadapted to 'hold' the same in engagement with the catch, said springadapted to yield to permit the bar to be moved over the catch to tripthe dog, said. bar having portions struck up from the side walls thereofbeyond said stop plate to hold the stop plate in position, said barhaving portions struck up from the side walls thereof on the oppositeside of the stop'plate and over which the spring may be removablythreaded into abutting engagement with the stop plate Yto securethe'spring in place.

In testimony whereof, we sign this specification. Y

FREDERICK KNGVVLSON. *JOHN HUBER STEVENSONZ,

